| As China strives to become a maritime power,the demand for ship propulsion systems keep increasing,herringbone gear transmission system,as one of the important components of the ship transmission system,also need to reduce the vibration and noise in marine propulsion systems.Gear modification can compensate for transmission errors and meshing impact caused by gear tooth deformation and various errors by trimming the shape of the tooth surface,so as to achieving the effect of vibration and noise reduction’s design method.However,there are inevitable manufacturing errors in the processing of herringbone gear.And the amount of modification is almost the same order of magnitude,which greatly interferes with the modification effect.In this paper,the herringbone gear transmission in ships is taken as the research object.In view of the above problems,this paper takes the ship herringbone gear transmission as the research object,and conducts the research on the optimal design of herringbone gear three maintenance shapes considering manufacturing errors through the tooth loaded contact analysis and dynamic analysis,and the main contents are as follows:(1)A set of mathematical model of manufacturing errors are established by random sampling,The tooth surface model of herringbone gear with manufacturing error is established and the effects of manufacturing errors on the theoretical gear pair loaded transmission error and load distribution coefficient are analyzed.The results of tooth loaded contact analysis show that the manufacturing error has a non-negligible influence on the amplitude of load transmission error and the load distribution of the tooth surface.(2)Multi-objective modification optimization design is performed with the amplitude of loaded transmission error,meshing impact force,and maximum tooth surface load distribution coefficient as optimization objectives to analyze the improvement effect of gear modification.Manufacturing error samples are introduced to study the influence of manufacturing errors on the optimization effect of theoretical modified tooth surfaces,and a modification optimization design method considering manufacturing error interference is proposed.The method can effectively reduce the influence of manufacturing error on meshing performance(3)A herringbone gear bending-torsion-axial coupling dynamic model with twelve degrees of freedom is constructed,and the calculation methods of meshing stiffness and meshing impact are determined.Analyzed the influence of manufacturing error on vibration characteristics The improvement effect of vibration characteristics of the theoretical modified tooth surfaces and the modified tooth surfaces considering manufacturing error interference is compared.The comparison of vibration characteristics shows that the tooth surface modification design with resistance to manufacturing error interference has better dynamic characteristics.(4)Four modification schemes are determined,to carry out the optimization design of modification considering the interference of manufacturing errors and the grinding of teeth with 4-level precision.A low-speed,high-torque loaded transmission error test bench and a high-speed,enclosed box vibration measurement test bench are set up to collect the loaded transmission error and box foot vibration data of the four sets of modified herringbone gear pairs,and the vibration reduction effect of various modified tooth surfaces under actual working conditions are compared.The best modification scheme is selected,and five test small wheels are manufactured to verify the anti-error interference ability of the best modification scheme in small-batch production of herringbone gear pairs.The experimental results show that the modification design method considering the interference of manufacturing error has obvious damping effect. |
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